When the service provided is a CLIA-waived test, which modifier is used to report this?

Question

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The modifier QW is used to indicate that a test is CLIA-waived. CLIA refers to the Clinical Laboratory Improvement Amendments, which set quality standards for all laboratory testing. The QW modifier is attached to codes to signify that the laboratory test performed is simple and carries a low risk for an incorrect result, thus it is waived from more stringent regulatory oversight.

When the Service Provided Is a CLIA-Waived Test, Which Modifier